A method of enabling transmission of a data service from a content server to a terminal using a data channel in a system in which at least part of the data service is transmitted to the terminal using a broadcast channel, the method including: receiving, using the broadcast channel, first data comprising part of the data service; processing the first data using a signature-generating algorithm to derive first signature data; transmitting the first signature data using the data channel to the content server; validating the first signature data by comparing said first signature data with a signature derived by processing data comprising part of the data service using a corresponding signature-generating algorithm; and enabling the terminal to access the data service using the data channel dependent on validation of the first signature data.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of enabling transmission of a data service from a content server to a terminal using a data channel in a system in which at least part of the data service is transmitted to the terminal using a broadcast channel and in which the terminal has been enabled to receive at least part of the data service transmitted using the broadcast channel, the method comprising: receiving, using the broadcast channel, first data comprising part of audio or video data of the data service; processing said first data using a signature-generating algorithm to derive first signature data; transmitting said first signature data using the data channel to the content server; validating said first signature data by comparing said first signature data with a signature derived by processing data comprising part of audio or video data of the data service, using a corresponding signature-generating algorithm; and enabling the terminal to access the data service using the data channel dependent on validation of the first signature data.
2. A method according to claim 1 , further comprising identifying said first data with respect to elements defining a transport stream packet.
3. A method according to claim 1 , wherein said first data comprises a Presentation Time Stamp.
4. A method according to claim 1 , further comprising identifying said first data with respect to elements defining teletext data.
5. A method according to claim 1 , further comprising identifying said first data with respect to elements defining subtitle data.
6. A method according to claim 1 , wherein said first data comprises signalling data.
7. A method according to claim 1 , wherein said first data comprises a title and/or synopsis string.
8. A method according to claim 7 , further comprising: generating the title and/or synopsis string using an Application Programming Interface provided by the terminal.
9. A method according to claim 1 , further comprising: downloading, using the data service, an application to the terminal; and using the application to generate at least part of said first data from data received using the broadcast channel.
10. A method according to claim 9 , further comprising downloading the application to the terminal using the broadcast channel.
11. A method according to claim 1 , further comprising sending a message from the content server to the receiver indicating which part of the data service comprises said first data.
12. A method according to claim 1 , further comprising: receiving a key from the server using the data channel at the receiver; and processing said first data using the key to produce the first signature.
13. A method according to claim 1 , wherein the signature-processing algorithm comprises an encryption algorithm.
14. A method according to claim 1 , wherein the signature-processing algorithm comprises a hash function.
15. A method according to claim 1 , wherein the signature-processing algorithm comprises an exclusive-or bitwise function.
16. A method according to claim 1 , wherein the signature-processing algorithm comprises a compression function.
17. A method according to claim 1 , further comprising: sending the first signature data to a validation server; and validating the first signature at the validation server by comparison with a plurality of signatures derived from data comprising part of the data service.
18. A method according to claim 17 , wherein each of said plurality of signatures is derived from a respective part of a transmitted data stream.
19. A method according to claim 1 , wherein said first signature data comprises at least part of a message from the terminal to the content server requesting helper data to assist Fast Channel Change of the data service.
20. A method according to claim 1 , wherein the broadcast channel is provided by one of a terrestrial video broadcast system, a satellite video broadcast system and a cable broadcast system.
21. A terminal arranged to receive a data service transmitted from a content server using a data channel in a system in which at least part of the data service is transmitted to the terminal using a broadcast channel and in which the terminal has been enabled to receive at least part of the data service transmitted using the broadcast channel, the terminal being arranged to: receive, using the broadcast channel, first data comprising part of audio or video data of the data service; process said first data using a signature-generating algorithm to derive first signature data; transmit said first signature data using the data channel to the content server for validation by comparison with a signature derived by processing data comprising part of audio or video data of the data service, using a corresponding signature-generating algorithm; and access the first data service dependent on validation of the first signature data.
22. Apparatus arranged to enable transmission of a data service from the content server to a terminal using a data channel in a system in which at least part of the data service is transmitted to the terminal using a broadcast channel and in which the terminal has been enabled to receive at least part of the data service transmitted using the broadcast channel, the content server being arranged to: receive first signature data transmitted using the data channel from the terminal, said first signature data having been derived by processing, using a signature-generating algorithm, first data comprising part of audio or video data of the data service received by the terminal using the broadcast channel; validate said first signature data by comparing said first signature data with a signature derived by processing data comprising part of audio or video data of the data service, using a corresponding signature-generating algorithm; and enable the terminal to access the first data service dependent on validation of the first signature data.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
October 14, 2011
September 2, 2014
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